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• One can pick the optimum value of one of the parameters thickness just by inspection since the maximum effective stress doesn't vary with thickness for this parameterproblem. So you don't need to input this parameter thickness as a design variable in ANSYS, saving you work and time. Note: In a 2D problem, the thickness is used only to calculate the traction from an applied force (through dividing the force by an appropriate area). The thickness does not enter anywhere else in the 2D mathematical model. In this problem, the traction is a pressure load, which is independent of the thickness.

• In both Workbench (the main project page) as well as Mechanical (where you set up the mesh, boundary conditions etc.), there is a menu option near the top to change units. You can use this to make sure you are working in consistent units.

• Updating the Design of Experiments step can take 30+ minutes especially if you have a slowpoke computer. This is because calculating the maximum effective stress for each DOE point involves a BIG stiffness matrix inversion.

• To plot the response surfaces, you need to set the x, y and z axes highlighted in the snapshot below. Double-click on Response Surface in the Project Schematic to get to this menu.
  
  

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